Surface chemistry of Ti6Al4V components fabricated using selective laser melting for biomedical applications
journal contributionposted on 12.08.2016, 12:56 by Jayasheelan Vaithilingam, Elisabetta Prina, Ruth Goodridge, Richard J.M. Hague, Steve Edmondson, Felicity R.A.J. Rose, Steven ChristieSteven Christie
© 2016 The Authors. Published by Elsevier B.V.Selective laser melting (SLM) has previously been shown to be a viable method for fabricating biomedical implants; however, the surface chemistry of SLM fabricated parts is poorly understood. In this study, X-ray photoelectron spectroscopy (XPS) was used to determine the surface chemistries of (a) SLM as-fabricated (SLM-AF) Ti6Al4V and (b) SLM fabricated and mechanically polished (SLM-MP) Ti6Al4V samples and compared with (c) traditionally manufactured (forged) and mechanically polished Ti6Al4V samples. The SLM-AF surface was observed to be porous with an average surface roughness (Ra) of 17.6 ± 3.7 μm. The surface chemistry of the SLM-AF was significantly different to the FGD-MP surface with respect to elemental distribution and their existence on the outermost surface. Sintered particles on the SLM-AF surface were observed to affect depth profiling of the sample due to a shadowing effect during argon ion sputtering. Surface heterogeneity was observed for all three surfaces; however, vanadium was witnessed only on the mechanically polished (SLM-MP and FGD-MP) surfaces. The direct and indirect 3T3 cell cytotoxicity studies revealed that the cells were viable on the SLM fabricated Ti6Al4V parts. The varied surface chemistry of the SLM-AF and SLM-MP did not influence the cell behaviour.
This work was supported by the Engineering and Physical Sciences Research Council (EPSRC; UK) under grant EP/I033335/2 and the Medical Research Council (MRC) -EPSRC Centre for Doctoral Training (CDT) in Regenerative Medicine (EP/L015072/1)